Building the 3D Printer Temperature control from an arduino prototype

So I decided to build my own temperature control unit. Here is my, Errrr masterpiece.

3D printer temperature controller

Here is the layout of my circuit board.

3D Printer Temperature Control Circuit

This layout above doesn’t show some things on my board like my voltage regulator for 5v power or my electrolytic and ceramic capacitors plus inductor for decoupling. I realized I needed those after I had mounted all this. YIKES!!